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Energy Consumption and Greenhouse Gas Emissions of High-Carbon Ferrochrome Production
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Process. Kobolde & Partners AB, Ringvägen 100, 118 60 Stockholm, Sweden.ORCID iD: 0000-0002-4990-3580
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Process.ORCID iD: 0000-0002-8802-4036
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Process.ORCID iD: 0000-0001-9775-0382
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Process. Kobolde & Partners AB, Ringvägen 100, 118 60 Stockholm, Sweden.ORCID iD: 0000-0003-1360-5765
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2023 (English)In: JOM: The Member Journal of TMS, ISSN 1047-4838, E-ISSN 1543-1851, JOM, ISSN 1047-4838, Vol. 75, no 4, p. 1206-1220Article in journal (Other (popular science, discussion, etc.)) Published
Abstract [en]

This work presents a process model developed based on mass and energy conservation to assess high carbon ferrochrome production from cradle to gate through four supply routes: (1) a conventional submerged arc furnace (SAF), (2) a closed submerged arc furnace with preheating (CSAF+PH), (3) a closed submerged arc furnace with 60% prereduction (CSAF+PR60%) and (4) a direct-current arc furnace (DCAF). The energy requirements are between 40 and 59 GJ/t FeCr (74–111 GJ/t Cr), and the greenhouse gas (GHG) emissions range between 1.8 and 5.5 tCO2-eq/t FeCr (3.3–10.3 tCO2-eq/t Cr). The upgrading of coal-powered SAF process to a closed furnace CSAF+PH and CSAF+PR60% contributes to an emission reduction of 23% and 18%, respectively. Moreover, the use of hydro-powered electricity leads to a further emission reduction of 68% and 47%, respectively. For CSAF+PR process, the GHG emissions can be reduced by 14% when increasing the pre-reduction ratio from 30% to 80% and decreased by 10% when charging hotter feed from 100 °C to 1000 °C. The proposed process model is feasible in generating site-specific inventory data and allowing for parameter studies as well as supporting companies to improve the transparency of the environmental performance in the FeCr value chain.

Place, publisher, year, edition, pages
Springer Nature , 2023. Vol. 75, no 4, p. 1206-1220
Keywords [en]
Energy consumption, greenhouse gas emissions, High carbon ferrochrom
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-327233DOI: 10.1007/s11837-023-05707-8ISI: 000944096100006Scopus ID: 2-s2.0-85149409488OAI: oai:DiVA.org:kth-327233DiVA, id: diva2:1758434
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QC 20230523

Available from: 2023-05-22 Created: 2023-05-22 Last updated: 2023-05-23Bibliographically approved

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Wei, WenjingSamuelsson, PeterJönsson, Pär G.Gyllenram, RutgerGlaser, Björn

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